/*
 * TeleStax, Open Source Cloud Communications  Copyright 2012.
 * and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.mobicents.protocols.ss7.map.service.mobility.locationManagement;

import java.io.IOException;

import org.mobicents.protocols.asn.AsnException;
import org.mobicents.protocols.asn.AsnInputStream;
import org.mobicents.protocols.asn.AsnOutputStream;
import org.mobicents.protocols.asn.Tag;
import org.mobicents.protocols.ss7.map.api.MAPException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentException;
import org.mobicents.protocols.ss7.map.api.MAPParsingComponentExceptionReason;
import org.mobicents.protocols.ss7.map.api.service.mobility.locationManagement.EPSInfo;
import org.mobicents.protocols.ss7.map.api.service.mobility.locationManagement.ISRInformation;
import org.mobicents.protocols.ss7.map.api.service.mobility.locationManagement.PDNGWUpdate;
import org.mobicents.protocols.ss7.map.primitives.MAPAsnPrimitive;

/**
 * 
 * @author Lasith Waruna Perera
 * 
 */
public class EPSInfoImpl  implements EPSInfo, MAPAsnPrimitive {
	
	public static final int _TAG_pndGwUpdate = 0;
	public static final int _TAG_isrInformation = 1;

	public static final String _PrimitiveName = "EPSInfo";
	
	private PDNGWUpdate pndGwUpdate;
	private ISRInformation isrInformation;
	
	public EPSInfoImpl() {
		super();
	}

	public EPSInfoImpl(PDNGWUpdate pndGwUpdate) {
		super();
		this.pndGwUpdate = pndGwUpdate;
		this.isrInformation = null;
	}
	
	public EPSInfoImpl(ISRInformation isrInformation) {
		super();
		this.pndGwUpdate = null;
		this.isrInformation = isrInformation;
	}

	@Override
	public PDNGWUpdate getPndGwUpdate() {
		return this.pndGwUpdate;
	}

	@Override
	public ISRInformation getIsrInformation() {
		return this.isrInformation;
	}

	@Override
	public int getTag() throws MAPException {
		if (this.pndGwUpdate != null)
			return _TAG_pndGwUpdate;
		else
			return _TAG_isrInformation;
	}

	@Override
	public int getTagClass() {
		return Tag.CLASS_CONTEXT_SPECIFIC;
	}

	@Override
	public boolean getIsPrimitive() {
		if (this.pndGwUpdate != null)
			return false;
		else
			return true;
	}

	@Override
	public void decodeAll(AsnInputStream ansIS)
			throws MAPParsingComponentException {
		try {
			int length = ansIS.readLength();
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}

	@Override
	public void decodeData(AsnInputStream ansIS, int length)
			throws MAPParsingComponentException {
		try {
			this._decode(ansIS, length);
		} catch (IOException e) {
			throw new MAPParsingComponentException("IOException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		} catch (AsnException e) {
			throw new MAPParsingComponentException("AsnException when decoding " + _PrimitiveName + ": " + e.getMessage(), e,
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}
	
	private void _decode(AsnInputStream ais, int length) throws MAPParsingComponentException, IOException, AsnException {
		
		this.pndGwUpdate = null;
		this.isrInformation = null;

		int tag = ais.getTag();

		if (ais.getTagClass() != Tag.CLASS_CONTEXT_SPECIFIC )
			throw new MAPParsingComponentException("Error while decoding " + _PrimitiveName + ": Primitive has bad tag class",
					MAPParsingComponentExceptionReason.MistypedParameter);

		switch (tag) {
		case _TAG_pndGwUpdate:
			if (ais.isTagPrimitive())
				throw new MAPParsingComponentException("Error while decoding " + _PrimitiveName + ": Parameter is primitive",
						MAPParsingComponentExceptionReason.MistypedParameter);
			this.pndGwUpdate = new PDNGWUpdateImpl();
			((PDNGWUpdateImpl) this.pndGwUpdate).decodeData(ais, length);
			break;
		case _TAG_isrInformation:
			if (!ais.isTagPrimitive())
				throw new MAPParsingComponentException("Error while decoding " + _PrimitiveName + ": Parameter is not primitive",
						MAPParsingComponentExceptionReason.MistypedParameter);
			this.isrInformation = new ISRInformationImpl();
			((ISRInformationImpl) this.isrInformation).decodeData(ais, length);
			break;

		default:
			throw new MAPParsingComponentException("Error while decoding " + _PrimitiveName + ": bad choice tag",
					MAPParsingComponentExceptionReason.MistypedParameter);
		}
	}


	@Override
	public void encodeAll(AsnOutputStream asnOs) throws MAPException {
		this.encodeAll(asnOs, this.getTagClass(), this.getTag());
	}

	@Override
	public void encodeAll(AsnOutputStream asnOs, int tagClass, int tag)
			throws MAPException {
		try {
			asnOs.writeTag(tagClass, this.getIsPrimitive(), tag);
			int pos = asnOs.StartContentDefiniteLength();
			this.encodeData(asnOs);
			asnOs.FinalizeContent(pos);
		} catch (AsnException e) {
			throw new MAPException("AsnException when encoding " + _PrimitiveName + ": " + e.getMessage(), e);
		}
	}

	@Override
	public void encodeData(AsnOutputStream asnOs) throws MAPException {
		
		if (this.pndGwUpdate == null && this.isrInformation == null)
			throw new MAPException("Error while encoding " + _PrimitiveName + ": all choices must not be null");
		if (this.pndGwUpdate != null && this.isrInformation != null)
			throw new MAPException("Error while encoding " + _PrimitiveName + ": all choices must not be not null");

		if (this.pndGwUpdate != null) {
			((PDNGWUpdateImpl)this.pndGwUpdate).encodeData(asnOs);
		} else {
			((ISRInformationImpl)this.isrInformation).encodeData(asnOs);
		}
	
	}
	
	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder();
		sb.append(_PrimitiveName);
		sb.append(" [");
		
		if (this.pndGwUpdate != null) {
			sb.append("pndGwUpdate=");
			sb.append(this.pndGwUpdate.toString());
		}
		
		if (this.isrInformation != null) {
			sb.append("isrInformation=");
			sb.append(this.isrInformation.toString());
		}

		sb.append("]");

		return sb.toString();
	}
	
	
}
